تقرير
Anisotropic power-law inflation for models of non-canonical scalar fields non-minimally coupled to a two-form field
| العنوان: | Anisotropic power-law inflation for models of non-canonical scalar fields non-minimally coupled to a two-form field |
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| المؤلفون: | Pham, Tuyen M., Nguyen, Duy H., Do, Tuan Q., Kao, W. F. |
| المصدر: | Eur. Phys. J. C 84, 105 (2024) |
| سنة النشر: | 2023 |
| المجموعة: | Astrophysics General Relativity and Quantum Cosmology |
| مصطلحات موضوعية: | General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics |
| الوصف: | In this paper, we investigate the validity of the so-called cosmic no-hair conjecture in the framework of anisotropic inflation models of non-canonical scalar fields non-minimally coupled to a two-form field. In particular, we focus on two typical {\it k}-inflation and Dirac-Born-Infeld inflation models, in which we find a set of exact anisotropic power-law inflationary solutions. Interestingly, these solutions are shown to be stable and attractive during an inflationary phase using the dynamical system analysis. The obtained results indicate that the non-minimal coupling between the scalar and two-form fields acts as a non-trivial source of generating stable spatial anisotropies during the inflationary phase and therefore violates the prediction of the cosmic no-hair conjecture, even when the scalar field is of non-canonical forms. In connection with the Planck 2018 data, tensor-to-scalar ratios of these anisotropic solutions are investigated. As a result, it appears that the tensor-to-scalar ratio of the anisotropic power-law inflationary solution of {\it k}-inflation model turns out to be more highly consistent with the Planck 2018 data than that of Dirac-Born-Infeld model. Comment: 24 pages, 8 figures. Final version with investigations on the tensor-to-scalar ratio added. Some discussions and relevant references are also added. All calculations remain unchanged. Accepted for publication in EPJC. Comments are welcome |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1140/epjc/s10052-024-12436-y |
| URL الوصول: | http://arxiv.org/abs/2309.02690 |
| رقم الأكسشن: | edsarx.2309.02690 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1140/epjc/s10052-024-12436-y |
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